package com.itheima.service;


import com.alibaba.dubbo.config.annotation.Reference;
import com.itheima.pojo.Permission;
import com.itheima.pojo.Role;
import com.itheima.pojo.User;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Component;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

@Component
public class SpringSecurityUserService implements UserDetailsService {
    //使用Dubbo通过网络远程调用服务提供方获取数据库中的用户信息
    @Reference
    private UserService userService;

    //根据用户名查询数据库获取用户信息，详细信息:用户(基本信息,角色信息(权限信息))
    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        User user = userService.findByUsername(username);
        if (user == null) {
            //用户名不存在
            return null;
        }
        List<GrantedAuthority> list = new ArrayList();//ROLE_ADMIN,CHECKITEM_ADD ,里面包含角色和权限信息
        //动态为当前用户授权
        Set<Role> roles = user.getRoles();//动态为当前用户授权
        for (Role role : roles) {//遍历角色集合,为用户授予角色
            //遍历角色集合
            list.add(new SimpleGrantedAuthority(role.getKeyword()));
            Set<Permission> permissions = role.getPermissions();
            //遍历权限集合,为用户授权
            for (Permission permission : permissions) {//遍历权限集合,为用户授权
                list.add(new SimpleGrantedAuthority(permission.getKeyword()));
            }
        }
        //User(a,b,c)  前端传来的用户名,数据库中的密码,用户所授予的权限
        org.springframework.security.core.userdetails.User securityUser = new org.springframework.security.core.userdetails.User(username, user.getPassword(), list);
        return securityUser;
    }
}
